Correct on all these posts, however 5 bobs in a 4 square foot brooder is hugely undersized for bobs. They need at least 1 to 2 square feet per bird and as they grow they may need more, as in 3 to 4 square feet. They are toe picking because they are cramped.

I have noticed this with my little bobs too, they just started doing this about a week ago. However they are in a large pen and have plenty of room, so figuring out how i can fix the problem if becoming a huge job. my next step right now is to separate the four hens that are injured on their feet, so I can focus on taking care of them without stressing them out to much.

I do have a question on the lighting answer:
My hens are laying, if I only have the red heat lamp going and no artificial light or sun light will they continue to lay?